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Commissioning the PHENIX RPC Forward Trigger Upgrade

Commissioning the PHENIX RPC Forward Trigger Upgrade. Michael Daugherity Abilene Christian University for the PHENIX Collaboration. Physics Motivation. DOE Frontier of Nuclear Science. Sources of proton spin:. ΔΣ : quark contribution valence quarks, well-known (but surprisingly small)

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Commissioning the PHENIX RPC Forward Trigger Upgrade

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  1. Commissioning the PHENIX RPC Forward Trigger Upgrade Michael Daugherity Abilene Christian University for the PHENIX Collaboration

  2. Physics Motivation DOE Frontier of Nuclear Science Sources of proton spin: • ΔΣ: quark contribution • valence quarks, well-known (but surprisingly small) • sea quark contribution has large uncertainties ΔG: gluon contribution being studied, likely to be small LZ: Orbital angular momentum, largely unknown

  3. Physics Motivation W-boson production gives nice access to anti-quark distributions in the proton. A polarizedproton experiment is sensitive to the polarization of the sea quarks • A very precise and clean measurement, both theoretically and experimentally. • A “cornerstone” of the RHIC spin program and a DOE milestone for 2013.

  4. Detecting Forward W’s W • We take advantage of PHENIX’s muon arms to look for W decays in the forward/backward region: • compliments PHENIX and STAR W analyses at mid-rapidity using electron/positron decay channel • Challenges in detecting W’s • Cross-section x Luminosity give us an expected interaction rate of 9.6 MHz • DAQ bandwidth for muon arm is 1-2 KHz • Need a rejection power of ~ 10,000 MuID New trigger background • Current muon trigger provides pt>2 GeV/c We need a new high-pt muon trigger to reduce backgrounds in W signal and maximize data-taking rate.

  5. Resistive Plate Chambers Use established CMS designs of resistive plate chambers to provide a large area, fast, and efficient high-pt muon trigger -10 kV Cathode x = 2mm Anode 0 kV W-trigger requirements All requirements are exceeded with RPC detectors

  6. Forward Upgrade Overview RPC3 (2009) RPC3 (2010) MuTRG (2008) MuTRG (2009) Hadron Absorber (2010) RPC1 (2011) • 2008/2009 – Muon Trigger FEE upgrade • 2009 – RPC Station 3 North installed • 2010 – Install RPC Station 3 South and hadron absorber • 2011 – RPC Station 1 planned install

  7. RPC Station 3 North RPC stations consist of 16 half-octants of three modules each RPC3N installation completed (2009) RPC3 Frame at UIUC

  8. Commissioning RPC3N • After Run 10 we sampled cosmic rays to study high momentum tracks in the RPC3N • Each station has (3 modules)*(64 channels/module)*(16 half-octants) = 3,072 channels to evaluate and monitor Entire Station 3N Half-octant with dead and hot channels Healthy half-octant module Hit rate (Hz/cm2) uninstrumented channels Overall good detector performance, some issues with gas distribution leading to loss of HV, some dead or noisy channels to address.

  9. RPC Station 3 South Installation completed about 6 weeks ago, and is being cabled as we speak. (Each station requires ~ 2 km of signal cable) Completed on Sep. 22 Significant effort underway to integrate this station for Run 11.

  10. Hadron Absorber North Hadron Absorber • Hadron (π or K) decaying to muon can produce a fake high-pt track • 35 cm of stainless steel (2 interaction lengths) significantly reduces background • Trade-off between our backgrounds and degrading other signals (e.g. J/ψ) • Absorber severely constrains space for station 1 RPC’s

  11. RPC Station 1 Prototype • With absorbers in place, we have final measurements for station 1 prototypes • Difficult balance between maximizing acceptance and leaving enough room for signal cables, HV/LV, gas, etc. • On schedule to be constructed and installed for Run 12 Station 1 Prototype RPC Station 1

  12. Conclusions • The W measurements are a cornerstone of the RHIC Spin program and an important component of the 500 GeV polarized proton collisions in the next few runs • The Forward Trigger Upgrade is preparing PHENIX to make these important measurements special thanks to the Forward Trigger Upgrade Collaboration • Abilene Christian University • University of California, Riverside • CIAE, Beijing • University of Colorado, Boulder • Columbia University and Nevis Laboratory • Georgia State University • University of Illinois, Urbana • Iowa State University • KEK • Korea University • Kyoto University • Los Alamos National Laboratory • Muhlenberg College • University of New Mexico • Peking University, Beijing • RIKEN Brookhaven Research Center • RIKEN • Rikkyo University

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